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Polylactate fiber

A technology of polylactic acid fiber and polylactic acid, which is applied in fiber processing, fiber chemical characteristics, single-component polyester rayon, etc., can solve problems such as poor mechanical properties at high temperature

Inactive Publication Date: 2005-08-31
TORAY IND INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Polylactic acid high-strength yarn has poor high-temperature mechanical properties, while PET high-strength yarn has excellent high-temperature mechanical properties. Therefore, it can be considered that high-temperature mechanical properties cannot be explained by simple room temperature strength.
In this way, poor high-temperature mechanical properties are a unique problem of polylactic acid fibers.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1、2

[0173] After drying poly-L lactic acid with a weight-average molecular weight of 190,000 and an optical purity of 99% L lactic acid, melt spinning is carried out at 240°C, and the yarn is cooled and solidified by blowing cold air at 25°C through the ventilator 4, and then used The bundle oiling yarn guide 6 is coated with fatty acid ester as the main fiber oil, and the yarn is staggered by the interlacing guide 7 ( Figure 9 ). Then, the undrawn yarn 10 is taken up by the non-heated second drawing roll 9 with a peripheral speed of 5000 m / min (the spinning speed is 5000 m / min) by the non-heated first drawing roll 8 . The undrawn homopoly-L-lactic acid yarn had a crystal size of 7.7 nm in the (200) plane direction, a degree of crystal orientation of 0.96, a U% of 0.8%, and an elongation at 25°C of 50%. For this undrawn yarn 10 use Figure 10The device was stretched and heat-treated according to the conditions shown in Table 1 to obtain a stretched yarn of 84 dtex, 24 filaments...

Embodiment 3、4

[0176] Spinning and drawing were carried out in the same manner as in Example 1, except that the spinning speed was 6000 m / min, to obtain a drawn yarn of 84 dtex and 96 filaments. The crystal size in the (200) plane direction of the undrawn yarn was 9.2 nm, the degree of crystal orientation was 0.96, the U% was 0.8%, and the elongation at 25° C. was 43%.

[0177] From the solid state NMR spectra of these stretched yarns it was confirmed that 3 1 spiral structure. In addition, its physical property values ​​are shown in Table 1. Compared with the conventional high-strength polylactic acid fiber (Comparative Example 1), the mechanical properties at 90° C. were significantly improved.

Embodiment 5

[0179] Spinning was carried out in the same manner as in Example 1, except that the peripheral speed of the first pulling roll 8 was 4000 m / min, the temperature of the first hot roll 12 during stretching was 110° C., and the draw ratio was 1.6 times. And drawing, obtained the homopolylactic acid drawing yarn of 84detx, 36 monofilaments, trilobal section. The spun-coiled yarn had a crystal size of 6.8 nm in the (200) plane direction, a crystal orientation degree of 0.91, a U% of 0.8, and an elongation at 25° C. of 72%. From the solid NMR spectrum of the stretched yarn, it was confirmed that 3 1 spiral structure. In addition, the physical property values ​​of this stretched yarn are shown in Table 1. Compared with the traditional high-strength polylactic acid fiber (Comparative Example 1), the mechanical properties at 90°C have been improved. In addition, the elongation of the fiber of Example 5 at 90° C. and a stress of 0.5 cN / dtex was 12%.

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Abstract

A poly(lactic acid) fiber has a strength at 90 DEG C of equal to or more than 0.8 cN / dtex and exhibits significantly satisfactory mechanical properties at high temperatures as compared with conventional poly(lactic acid) fibers.

Description

technical field [0001] The invention relates to polylactic acid fibers with excellent high-temperature mechanical properties. Background technique [0002] Recently, in response to environmental problems on a global scale, the development of polymer materials that can be decomposed in the natural environment has been urgently desired, so research, development, and practical use of various polymers such as aliphatic polyesters are being actively carried out try. Attention is also being focused on polymers that can be broken down by microorganisms, known as biodegradable polymers. [0003] However, almost all conventional polymers use petroleum resources as raw materials. There is a possibility that oil resources will be exhausted in the future. In addition, due to the massive consumption of oil resources, the carbon dioxide accumulated in the formation since the geological age is continuously released into the atmosphere, and the resulting global warming continues to increa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D01F6/62D01F6/92
CPCD01F6/92D01F6/625Y10T428/29Y10T428/2913Y10T428/2929Y10T428/2967Y10T442/3008Y10T442/641D01F6/62
Inventor 越智隆志堺崇晃前田裕平
Owner TORAY IND INC
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